JPH10108167A - Video doorphone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the video doorphone system in which alarming by a speaker of a doorphone slave set with camera based on a security device is conducted independently of an operating state of an interphone master set with a television receiver. SOLUTION: The system is provided with a doorphone slave set with camera 1 that provides an output of a video signal resulting from pick-up by a television camera 1a to a connection line and whose drive power supply is obtained from the connection line, an interphone master set with a television receiver 2 that receives the video signal, displays a video image picked up by the doorphone slave set with camera 1 and supplies power to the doorphone slave set with camera 1, and with a security device 3. In this case, the doorphone slave set with camera 1, the interphone master set with a television receiver 2 and the security device 3 are interconnected by 2-wire connection lines L1, L2 via multiplexer/demultiplexer circuits 1h, 2a, 3d that conduct multiplexing/ demultiplexing of auio, video, control signals and a DC power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video door phone system, and more particularly to a video door phone system provided with a security device for inputting a detection signal from a security sensor such as a smoke detector to generate an alarm sound or the like.

[0002]

2. Description of the Related Art Conventionally, a security device for inputting a sensing signal from a security sensor such as a smoke detector to generate an alarm sound or the like has been added to a TV door phone system for confirming a visitor's image in a house or the like and making a call. In the case of configuring the system, the system is formed as shown in the system configuration diagram of FIG. Specifically, there is a two-wire equilibrium between a door phone slave unit with a camera (hereinafter, referred to as a camera slave unit) 1 installed at the entrance and a master unit with a monitor TV (hereinafter, referred to as master unit) 2 installed in a living room. The audio circuit and the control circuit are connected by multi-core connection lines L3 and L4 between the base unit 2 and the security device 3 installed near the base unit 2 by connection lines L1 which are cables. You.

[0003] The camera slave unit 1 captures a visitor and outputs a video signal, a television camera 1a, a video modulation circuit 1b for FM-modulating the video signal, and a transmission voice, which is converted into an electrical voice signal. A microphone 1c corresponding to a call microphone, a speaker 1d corresponding to an audio output speaker for outputting audio from a living room, a microphone amplifier 1e for amplifying an audio signal from the microphone 1c, and a driver for driving the speaker 1d. A speaker amplifier 1f for amplifying the received voice signal;
A two-wire / four-wire conversion circuit 1g for converting four-wire wiring into two-wire wiring so that transmission and reception can be performed by a pair of wirings; A demultiplexing circuit 1h for separating a DC component as a power input from the input DC input and a control signal from the base unit 2, a control signal receiving circuit 1i for receiving the separated control signal, and a received control signal A control signal demodulation circuit 1j for demodulating the control signal, a control signal modulation circuit 1k for modulating a control signal directed to the base unit 2, a control signal transmission circuit 11 for transmitting the modulated control signal, and a visitor. Is connected to a push button switch 1n or the like used for notifying the visitor to control the operation of each circuit of the camera slave unit 1.
A connection line L1 connects the PU1m, a power supply circuit 1o for stabilizing the separated DC power supply to a predetermined voltage value to supply power to each circuit of the camera slave unit 1, and the master unit 2. And a pair of connection terminals 1p.

A master unit 2 includes a multiplexing / demultiplexing circuit 2a for multiplexing and separating audio signals, video signals, control signals, and a DC output as a power supply output to the camera slave unit 1, and a multiplexing / demultiplexing circuit 2a. A video demodulation circuit 2b for demodulating a video signal, a monitor television 2c for displaying a video of a visitor, a handset 2d having a microphone and a speaker for talking to a camera slave, and an amplifying audio signal from the microphone of the handset. Microphone amplifier 2e, a speaker amplifier 2f for amplifying an audio signal and driving a speaker of a handset, and a 2-wire 4-wire for converting 4-wire wiring to 2-wire wiring for transmitting and receiving by a pair of wirings. Conversion circuit 2g
A control signal receiving circuit 2h for receiving the separated control signal, a control signal demodulation circuit 2i for demodulating the received control signal, and a control signal for modulating a control signal directed to the camera slave 1. A modulation circuit 2j, a control signal transmission circuit 2k for transmitting a modulated control signal, an operation switch 2m for receiving a security detection signal from the security device 3 and performing a predetermined operation input, and the like are connected to each other. CPU 21 for controlling the operation of each circuit of the machine 2
And stabilize the AC power supply to a predetermined DC voltage value to supply power to each circuit of the base unit 2 and
A power supply circuit 2n for outputting the DC power supply to the demultiplexing circuit 2a, an alarm sound amplification circuit 2o for amplifying an alarm sound signal from the security device 3, and the camera slave unit 1 are connected by a connection line L1. A pair of connection terminals 2p for
It has connection terminals 2q and 2r having a predetermined number of connection portions for connecting with the security device 3 by connection lines L3 and L4.

[0005] The security device 3 amplifies the alarm sound signal to a predetermined signal level in order to sound an alarm sound generation circuit 3a for generating an alarm sound signal and to output the sound to the master unit 2 while sounding the speaker 3c. An alarm sound output circuit 3b;
An alarm state output circuit 3e for displaying on the display device 3d by an LED element or the like and transmitting an alarm state to the master unit 2 and a sensing signal from a security sensor such as a smoke sensor 41 and a gas sensor 42 are inputted. In addition, an emergency switch 3f for inputting an operation for emergency notification is connected to the CPU 3g for controlling the operation of each circuit of the security device 3, and a predetermined for supplying power to each circuit of the security device 3. A connection terminal 3 having a predetermined number of connection portions for connecting the power supply circuit 3h which stabilizes and outputs the voltage value to the master unit 2 by connection lines L3 and L4.
i, 3j and connection terminals 3k, 3l for connection with the security sensor.

In the above configuration, DC power of the camera slave 1 is supplied from the power supply circuit 2n of the master 2 via the demultiplexing circuit 2a.
Can talk with the visitor while checking the video by the. Then, for example, when the smoke detector 41 detects the generation of smoke, a detection signal from the smoke detector 41 is input to the security device 3, and the alarm is sounded on the speaker 3c and the content of the alarm is displayed on the display device 3f. Then, the alarm sound signal of the alarm sound is output to the alarm sound amplifier circuit 2o of the base unit 2.
The signal is also input to the 2-wire to 4-wire conversion circuit 2g via the demultiplexer 2a and then to the camera slave 1 via the demultiplexer 2a. as a result,
An alarm sound signal emitted from the security device 3 is also notified from the camera slave 1 to the outside of the house via the speaker 1c.

[0007]

By the way, in the above-mentioned television door phone system, the output of the alarm sound signal from the security device 3 to the camera slave unit 1 is transmitted to the camera slave via the connection terminal of the master unit 2 and the circuit. Input to the device 1. Therefore, at the time of operation confirmation inspection during construction, it is necessary to confirm the circuit operation of the master unit 2 in pursuit of the cause when the alarm sound is not output from the camera slave unit 1 despite the sensing output from the security sensor. It took time and effort. In addition, the TV intercom system has a problem that the security device 3 cannot output an alarm sound from the security device 3 to the camera slave unit 1 in the event of a trouble in the power supply circuit including the AC power supply of the master unit 2. Met.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to make an alarm sound of a speaker of a door phone slave unit with a camera by a security device irrespective of an operation state of an intercom master unit with a television. It is an object of the present invention to provide a TV intercom system capable of performing the above operations.

[0009]

In order to achieve the above object, a television intercom system according to claim 1 outputs a video signal photographed by a television camera to a connection line and obtains a driving power from the connection line. With the intercom master unit with a TV, an intercom master unit with a TV that inputs the video signal and displays the image taken by the sub unit with a camera and supplies power to the sub unit with a camera, and security sensors such as smoke detectors In a TV door phone system having a security device having a security function of inputting a sensing signal and generating an alarm sound, etc., a camera door phone slave unit, a monitor TV base unit and a security device, an audio signal, Two lines via a demultiplexing circuit that multiplexes and separates video signals, control signals, and DC power It is set to be connected by a connecting line. As a result, the security device is directly connected to the intercom slave unit with camera.

[0010] In a second aspect of the present invention, the security device according to the first aspect has a power supply circuit for supplying DC power to the intercom slave unit with a camera via the demultiplexing circuit. Thereby, the power supply of the intercom slave unit with camera can be supplied from the security device.

According to a third aspect of the present invention, there is provided a television door phone system, wherein the power supply circuit of the security device has opening / closing means for controlling the connection to the multiplexing / demultiplexing circuit. The opening / closing means is closed and supplies DC power. As a result, the power supply circuit of the security device supplies DC power to the camera-equipped doorphone slave only when a security alarm sound is generated, so that the power supply of the camera-equipped doorphone slave during normal times becomes unnecessary.

According to a fourth aspect of the present invention, there is provided a television intercom system according to the first aspect, wherein a call microphone and a voice output speaker are connected to the demultiplexing circuit via a two-wire / four-wire conversion transformer. I'm going to do that. As a result, the audio output speaker receives an audio signal through the two-wire / four-wire conversion transformer, and outputs the alarm sound from the alarm sound output circuit even if DC power is not supplied from the power supply circuit of the parent device with the monitor TV to the subphone with camera. An alarm is sounded by the alarm sound signal.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a television doorphone system according to the present invention will be described below with reference to FIG. 1 and a second embodiment will be described with reference to FIGS.

[First Embodiment] FIG. 1 is a system configuration diagram of a TV door phone system according to a first embodiment.

The TV door phone system according to the present embodiment includes a camera slave unit 1, a master unit 2, and a security device 3, similarly to the conventional one. The difference from the conventional one is that the demultiplexing circuits 1h, 2a, which multiplex and demultiplex the audio signal, the video signal, the control signal, and the DC power supply between the camera slave unit 1, the master unit 2, and the security device 3. 3d
, Two connection lines L1, L which are balanced two-wire cables
2 in that they are connected. The intercom slave unit with camera 1 is the same as the conventional one, and the intercom master unit with television 2 is the same as the conventional one except that it does not have the alarm sound amplification circuit 2o for amplifying the alarm sound signal from the security device 3. Therefore, detailed description is omitted.

The security device 3 includes an alarm sound generating circuit 3a for generating an alarm sound signal, and an alarm sound signal for sounding the speaker 3c and outputting the signal to the camera slave unit 1 at a predetermined signal level. An alarm sound output circuit 3b that amplifies the alarm sound signal and an alarm sound signal for the camera slave 1.
A demultiplexing circuit 3d for multiplexing and separating the control signal and the DC power supply output, a control signal receiving circuit 3e for receiving the separated control signal, a control signal demodulation circuit 3f for demodulating the received control signal, A control signal modulation circuit 3g for modulating a control signal directed to the camera slave 1, and a control signal transmission circuit 3h for transmitting the modulated control signal.
An AC power supply for supplying a DC power to the camera subunit 1 via an open / close switch 3m corresponding to an open / close means via the CPU 3j, each circuit of the security device 3, and the demultiplexing circuit 3d. A pair of connection terminals 3n for connecting the power supply circuit 31 that stabilizes and output the voltage value to the camera slave unit 1 with the connection line L1, and a connection line L2 for connecting the master unit 2 with the base unit 2. It has a pair of connection terminals 3o and connection terminals 3p and 3q for connecting with the security sensor.

The CPU 3j is connected to a display device 3i such as an LED element or the like, receives an input of a sensing signal from a security sensor such as a smoke sensor 41, a gas sensor 42 or the like, and performs an emergency switch 3k for performing an operation input for an emergency notification. Are connected to control the operation of each circuit of the security device 3, and are formed by a one-chip microcomputer or the like.

The connection terminal 3n is directly connected to the demultiplexing circuit 3d. The connection terminal 3o is connected to the demultiplexing circuit 3d directly or via a capacitor 3s by switching the changeover switch 3r. Changeover switch 3r
Is controlled by the CPU 3j so that the switch 3m is closed when the open / close switch 3m is closed and the power supply circuit 31 outputs DC power toward the demultiplexing circuit 3d, and is directly connected otherwise. . The capacitor 3s is a coupling capacitor for passing only a video signal, an audio signal, and a control signal between the camera slave unit 1 and the master unit 2 when outputting DC power from the power supply circuit 31 to the demultiplexing circuit 3d. Only at this time, the DC power from the master unit 2 to the camera slave unit 1 is cut off and no power is supplied.

The TV intercom system described above comprises:
Normally, the DC power supply to the camera slave unit 1 is supplied from the power supply circuit 2n of the master unit 2 via the demultiplexing circuit 2a, and the resident checks the image by the camera slave unit 1 with the master unit 2. You can talk with visitors. Then, for example, when the smoke detector 41 detects the generation of smoke, first, a detection signal from the smoke detector 41 is transmitted to the CP of the security device 3.
The signal is input to U3j, and an alarm sound signal is emitted from the alarm sound generation circuit 3a by the CPU 3j. The alarm sound signal is amplified to a predetermined signal level by the alarm sound output circuit 3b to cause the speaker 3c to sound an alarm, and the display device 3i displays the contents of the alarm. Next, the open / close switch 3m is closed, and the changeover switch 3r is switched to the connection on the capacitor 3s side. DC power is supplied from the power supply circuit 31 of the security device 3 to the camera slave 1 via the demultiplexing circuit 3d. And the alarm sound signal is
The alarm sound is output from the alarm sound output circuit 3b to the camera slave 1 via the demultiplexing circuit 3d, and is also notified to the outside of the house via the speaker 1d via the demultiplexing circuit 1h of the camera slave 1.

According to the television doorphone system described above, the security device 3 is the doorphone slave unit 1 with a camera.
Is connected directly to the security device 3
The alarm can be sounded by the speaker 1d of the intercom slave unit 1 with a camera regardless of the operation state of the intercom master unit 2 with a television, so that a circuit operation trouble can be easily and safely used. In addition, since the power supply of the intercom slave unit with camera 1 can be supplied from the security device 3, the intercom master unit with television 2 can be supplied.
Door phone slave unit 1 with camera regardless of the operating state of the camera
Alarm can be sounded. In addition, the power supply circuit 31 of the security device 3 supplies DC power to the camera-equipped doorphone slave device 1 only when a security alarm sound is generated, so that power supply of the camera-equipped doorphone slave device 1 in normal time is not required. By not supplying power to the television camera 1a and the video modulation circuit 1b, a low output capacity is sufficient, and therefore, the size can be reduced.

[Second Embodiment] FIG. 2 is a system configuration diagram of a TV door phone system according to a second embodiment. FIG. 3 is a connection diagram of a two-wire / four-wire conversion transformer, which is a main part of the TV door phone system shown in FIG.

The TV door phone system of the present embodiment includes a camera slave 1, a master 2, and a security device 3, as in the first embodiment. The configuration of a part of the camera child device 1 and the security device 3 and the connection between the camera child device 1, the parent device 2 and the security device 3 are different from those of the first embodiment. Are the same as those in the first embodiment, and a detailed description thereof will be omitted.

The connection between the camera slave unit 1, the master unit 2 and the security device 3 is performed by the respective demultiplexing circuits 1
h, 2a, and 3d, are connected by two connection lines L1 and L2, which are balanced two-wire cables. More specifically, as shown in FIG.
A connection line L1 between the connection terminal 3t of the security device 3 and
The connection terminal 3n of the security device 3 and the connection terminal 2p of the parent device 2 are connected by a connection line L2. This connection form may be between the connection terminal 1p of the camera slave unit 1 and the connection terminal 2p of the master unit 2, or between the connection terminal 3t of the security device 3 and the connection terminal 2p of the master unit 2.

As shown in FIG. 3, the camera slave 1 has a microphone 1c for talking and a speaker 1 for voice output.
d is a demultiplexing circuit 1 via a two-wire / four-wire conversion transformer 1q.
h. The two-wire / four-wire conversion transformer 1q directly sounds the speaker 1d connected to the secondary side by a sound signal such as an alarm sound signal output from the alarm sound amplifier circuit 3b of the security device 3 and input to the primary side. A microphone 1c is connected to an intermediate tap on the primary side via a microphone amplifier 1e and a coupling capacitor 1r.

In the security device 3, the power supply circuit 31 stabilizes the AC power to a predetermined DC voltage value and outputs the DC power only to each circuit of the security device 3.
It has a pair of connection terminals 3t for connecting the camera slave unit 1 or the master unit 2 by a connection line which is a two-wire balanced cable. This connection terminal 3t is connected to a demultiplexing circuit 3d.
Is directly connected to

The TV intercom system described above comprises:
The DC power supply to the camera slave unit 1 is supplied from the power supply circuit 2n of the master unit 2 at normal times and at the time of, for example, the occurrence of an abnormality when the smoke detector 41 detects the generation of smoke. Then, the alarm sound signal emitted from the alarm sound generation circuit 3a of the security device 3 is amplified to a predetermined signal level by the alarm sound output circuit 3b to sound the alarm of the speaker 3c, and to the camera via the demultiplexing circuit 3d. The signal is output to the demultiplexing circuit 1h of the slave 1. Then, the loudspeaker 1d directly sounds an alarm via the multiplexing / demultiplexing circuit 1h of the camera slave unit 1 and the 2-wire / 4-wire conversion transformer 1q.

According to the TV doorphone system described above, the speaker 1d of the doorphone slave unit 1 with a camera has two speakers.
An audio signal is input via the line-to-wire conversion transformer 1q, and an alarm sound signal from the alarm sound output circuit 3b even if DC power is not supplied from the power supply circuit 2n of the parent device 2 with monitor TV to the door phone slave device 1 with camera. , The intercom master unit with television 2
Door phone slave unit 1 with camera regardless of the operating state of the camera
Alarm can be sounded.

[0028]

According to the TV intercom system of the first aspect, the security device is directly connected to the camera-equipped doorphone slave unit, so that the alarm sound from the security device using the speaker of the camera-equipped doorphone slave device is attached to the television. This can be performed irrespective of the operation state of the intercom master unit, so that a circuit operation trouble can be easily dealt with and used safely.

Further, in the television door phone system according to the second aspect, in addition to the effect of the first aspect, the power supply of the slave unit with the camera can be supplied from the security device. The alarm of the intercom unit with camera can be sounded reliably regardless of the operation state.

Further, in the television door phone system according to the third aspect, in addition to the effect of the second aspect, the power supply circuit of the security device supplies DC power to the camera door phone slave only when a security alarm sound is generated. Since the power supply to the camera-equipped door phone slave unit 1 in the normal state becomes unnecessary, the power supply to the TV camera unit and the video modulation circuit is not performed, so that a low output capacity is sufficient.
Therefore, it can be formed small.

Further, in the television door phone system according to the fourth aspect, in addition to the effect of the first aspect, since the audio output speaker receives an audio signal through a two-wire / four-wire conversion transformer, it has a simple configuration. The alarm of the intercom slave unit with camera can be sounded surely regardless of the operation state of the intercom master unit with television.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a TV door phone system according to a first embodiment of the present invention.

FIG. 2 is a system configuration diagram of a TV door phone system according to a second embodiment.

FIG. 3 is a connection diagram of a two-wire / four-wire conversion transformer, which is a main part of the TV door phone system shown in FIG.

FIG. 4 is a system configuration diagram of a conventional TV door phone system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door phone handset with a camera 1a TV camera 1c Microphone (communication microphone) 1d Speaker (audio output speaker) 1q Two-wire / four-wire conversion transformer 1h Demultiplexing circuit 2 Intercom master unit with TV 2a Demultiplexing circuit 3 Security device 3d Demultiplexing circuit 3l power supply circuit 3m open / close switch (open / close means) L1, L2 connection line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiro Tanigawa 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 72) Inventor Masahiro Asahita 1048 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd.

Claims (4)

[Claims] 1. An intercom unit with a camera that outputs a video signal captured by a television camera to a connection line and obtains driving power from the connection line, and an image captured by the intercom unit with a camera that receives a video signal and receives a video signal. And a security device having a security function of inputting a sensing signal from a security sensor such as a smoke detector to generate an alarm sound, etc. In a television doorphone system provided with a camera, a doorphone slave unit with a camera, a master unit with a monitor TV, and a security device are connected via a demultiplexing circuit that multiplexes and separates audio signals, video signals, control signals, and DC power. A TV door phone system, wherein the TV door phone system is connected by a wire connection line. 2. The television doorphone system according to claim 1, wherein the security device has a power supply circuit for supplying DC power to the camera-equipped doorphone slave unit via the demultiplexing circuit. 3. The power supply circuit of the security device has an opening / closing means for controlling the connection with the multiplexing / demultiplexing circuit, and when a security alarm sound is generated, the opening / closing means is closed to supply DC power. The TV door phone system according to claim 2, wherein 4. The intercom system with a camera according to claim 1, wherein the intercom unit with a camera has a call microphone and an audio output speaker connected to the demultiplexing circuit via a two-wire / four-wire conversion transformer. .